加速高速车辆排放噪声的测量

[中文适用范围]： 本 SAE 标准等同于 ISO 362-1997，除附录 A 中详述的差异外，并包含 WP 29 在 ECE R51 修订版 1 以及 EEC 92/97 和 EEC 96/20 中采用的修改。本文档规定了测量所有类型（摩托车除外）加速公路车辆在中档利用可用发动机功率时发出的噪声的工程方法。该方法旨在满足在真实车辆运行条件下简单性和结果可重复性的要求。测量结果涉及产生与城市驾驶一致的最高噪声水平并导致可重复排放的车辆运行条件。因此，规定了从给定发动机或车辆速度开始的节气门全开加速测试。测试方法要求在只能在大片开阔空间中获得的声学环境中进行。此类条件通常可提供：a. 制造阶段的测量；b. 官方测试站的测量。必须在符合本文件所述要求的声学环境中进行测量。需要注意的是，随机选择的车辆很少能在理想的声学环境中进行抽查。如果必须在不符合本文件所述要求的道路声学环境中进行测量，则应认识到所得结果可能与使用指定条件获得的结果有显著偏差。本方法所得结果提供了在规定的测试条件下发出的噪声的客观度量。然而，有必要考虑这样一个事实，即对不同类型的机动车的主观 annoyance 评价并非简单地与声级计的指示相关。摩托车由其他 SAE 文件涵盖，这些文件规定了更符合实际使用情况的运行模式。 [外文原描述]： This SAE Standard is equivalent to ISO Standard 362 - 1997 except for the differences detailed in Appendix A , and includes the modifications adopted by WP 29 in ECE R51 Revision 1 and EEC 92/97 and EEC 96/20.This document specifies an engineering method for measuring the noise emitted by accelerating highway vehicles of all types (except motorcycles) in intermediate gears with full utilization of the available engine power.The method is designed to meet the requirements of simplicity and reproducibility of results under realistic vehicle operating conditions.Measurements relate to operating conditions of the vehicle which give the highest noise level consistent with urban driving and which lead to reproducible noise emissions. Therefore, an acceleration test at full throttle from a stated engine or vehicle speed is specified.The test method calls for an acoustical environment which can only be obtained in an extensive open space. Such conditions can usually be provided for:aMeasurements at the manufacturing stagebMeasurements at official testing stationsMeasurements must be carried out in an acoustical environment which fulfill the requirements stated in this document. It should be noted that spot checking of vehicles chosen at random can rarely be made in an ideal acoustical environment. If measurements have to be carried out on the road in an acoustical environment which does not fulfill the requirements stated in this document, it should be recognized that the results obtained may deviate appreciably from the results obtained using the specified conditions.The results obtained by this method give an objective measure of the noise emitted under prescribed conditions of test. However, it is necessary to consider the fact that the subjective appraisal of the annoyance of different classes of motor vehicles is not simply related to the indications of a sound level meter. The motorcycles are covered in other SAE documents that prescribe an operating mode that is more representative of actual use.Cross Reference: